Electric lamp.



No. 790,551. PATENTED MAY 23,1905. BENNETT? v ELECTRIC LAMP.

LPPLIOATIOH IILED' SEPT. 26; 1903.

WITNESSES:

' llVl/EN TOR Q UNITED STATES Patented May 23,- 1905.

PATENT OFFICE.

EDWARD BENNETT, OF PITTSBURG. PENNSYLVANIA, ASSIGNOR TO GEORGE WESTINGHOUSE, OF PITTSBURG, PENNSYLVANIA.

ELECTRIC LAMP.

SPECIFICATION forming partof Letters Patent No. 790,551, dated May 23, 1905.

Application filed September 26, 1903. Serial No. 174,766.

'1'0 (ZZZ whom it may concern:

Be itknown that I, EDWARD BENNETT, a citizen of the United States, and a resident of Pittsburg, in the county of Allegheny and type in which the light-emitting member or glower is a conductor only when heated to comparatively high temperatures.

The object of my invention is to provide a lamp of simple and inexpensive construction in which the glower, heater, and non-c0nducting support therefor are combined in a single removable structure which may be readily inserted in position in the lamp and as readily removed when desired and which is automatically connected in circuit for operation-when inserted in suitable position in the lamp structure.

In the accompanying drawings, Figure 1 is a view, partiallyin section and partially in side elevation, of a lamp embodying my invention. Fig. 2 is a detail side elevation of certain parts shown in Fig. 1 and at right angles to theillustration in said figure. Fig. 3 is a diagram of the operating elements and circuits of the lamp. Figs. 4 and 5 are detail views of the separable contact-terminals; and Fig. 6 is a detail view of separable contactterminals, one of which is of modified construction.

The operating parts of the lamp, to be hereinafter described, are located in a suitable metal housing 1, to the lower end of which is attached a' glass globe 2. Seated in the upper portion of the housing 1 and fastened in position by means of a removable'cap 3 is a porcelain block 4, the neck 5 of which is provided with terminals 6 and 7 of a type that is common in carbon-filament lamps. Securely cemented in recesses or sockets in the block 4, so as to project downwardly at right angles to its bottom'face, are three spring-arms 8, 9,

and 10, the free ends of which are preferably reduced in Width and bent inward approximately at right angles to the main portions,

"as indicated at 11. a The upper portion of thearm 10 is provided with alongitudinal slot12 to receive a screw-pin 13, the latter being adjustably clamped in position by means of a nut and washer 14. Upon the inner end of the pin 13 is pivotally mounted the upper end of the cut-out armature 15. The core 16 of the cut-out coil 17 is of approximately L shape, and its upper end is seated in a recess in the face of the block 4 and is fastened in position and electrically connected to the lamp-terminal 6 by a rod 18. The lower free end 19 'of the core 16 constitutes the stationarycontactterminal of the cut-out. One terminal of the coil 17 is connected to the core 16, and its other terminal is connected, by means of a plug 20, to a spring-arm 21, that projects from the block 4 and is bent laterally and perforated at its free end 22 to engage the lower end of the ballast-tube 23 and hold it in position with its upper end seated in a recess 23 in the face of the block 4. One terminal of the ballastwire 24 is connected to the arm 21 by means.

non-conducting material, and the heater 33,

which is here shown as of helical form and surrounding the glower, is also supported from the lower face of the holder 32 by means of arms 34.

The holder 32 may be of any suitable form; but it is here shown as an oblong plate having a thickened edge 35, which is provided at one side with a recess 36 and at the opposite side with two similar recesses 37 and 38.

As shown in Figs. 1 to 5,.the lead-wire 39, that is common to the heater and the glower, is attached to a cup 40, of suitable material or suitably-plated material, and the cup is seated in the recess 36. to be engaged by the end 11 of the arm 8. The separate lead-wires 41 and 42 from corresponding ends of the glower and heater are also attached to cups 40, that are seated in the recesses 37 and 38 to be respectively engaged by the ends 11 of the arms 9 and 10.

In the modification shown in Fig. 6 the rim 35 of the holder 32 is provided with narrow grooves 43, extending across its face and around its edge to the corresponding recess. The heater and glower terminal wires lie in these grooves and are bent into the recesses and project beyond and through lateral holes 44 just inside the rim, so as to lock the wires in position.

The wire which is threaded through the grooves or holes and recesses in the holder should be of sufiicient cross-sectional area to insure adequate contact-surface for the ends 11 of the arms 8, 9, and 10 and be both inexpensive and capable of withstanding the temperature which obtains in this part of the lamp Without deterioration. 1 have found that silver wire fulfils these conditions most satisfactorily.

It will be understood from the foregoing description, in connection with the illustration, that the heater and glower and their holder may be readily removed by springing the arm 8 outwardly sufficiently to withdraw the inturned end 11 from the corresponding recess, and when it is desired to replace the holder the bending of the arm 8 will permit the holder to be snapped into position, and when in that position the resilience of these arms will hold their inturned ends in contact with the terminal wires or cups, so that the necessary current for the heater and glower will be satisfactorily transmitted.

1 claim as my invention 1. A glower and heater'holder for electric lamps comprising a non-conducting plate or block having recesses in its edges in which are seated the contact-terminals of the glower and heater.

2. A glower and heater holder for electric lamps comprising a non-conducting plate having recesses in its edges, in combination with a glower and a heater supported by said plate and having contact-terminals that are seated in said recesses.

3. In an electric lamp, a glower, a heater and a non-conducting supporting-plate therefor having recesses in its edges and holes leading thereto, the glower and heater terminal wires being threaded through said holes and having contact portions seated in said recesses.

4. In an electriclamp, the combination with a plurality of spring-arms having intu rned free ends, of a glower, a heater and a non-conductinghold er having edge recesses,the glower and heater having contact-terminals seated in said recesses to be engaged by the inturned ends of said spring-arms.

5. In an electric lamp, the combination with a glower, a heater and a non-conducting supporting-plate therefor having recesses in its edges into which the glower and heater eontact-tcrminals are seated, of spring terminal arms having inturned free ends that enter said recesses to make contact with the contact-terminals and support the plate.

6. In an electriclamp, the combination with a glower, a heater and a supporting-plate having edge recesses and adjacent holes to receive the glower and heater terminal wires, of depending spring-arms having inturned ends that engage the contact-terminals in said recesses.

7. In an electric lamp, the combination with a glower, a heater and a non-conducting supporting-plate having thickened edges provided with a plurality of recesses and with passages leading thereto to receive the glower aml heater terminal wires, of a plurality of depending spring-arms having inturned ends that removably [it into said recesses and engage the contact-terminals in said recesses.

8. In an electric lamp, the combination with a glower, a heater and a non-conducting supporting-plate having holes therein into which the heater and glower terminal wires project and having a thickened edge provided with passages and recesses to receive said terminal wires, of depending spring-arms having inturned ends that lit into said recesses and make conductive contact with the contact-terminals in said recesses.

9. In an electric lamp, a non-conducting block having spring contact-arms cemented thereto and projecting therefrom, and a glower-holder detachably supported by the free ends of said arms.

10. In an electric lamp, a two-part, separable housing, a non-conducting block having a flange that is detachably clamped between the two parts of the housing, and controlling mechanism suspended from said block within the housing.

11. In an electric lamp, a housing, a nonconducting block removably supported therein, spring-arms having their upper ends cemented in recesses in said block and a glower and heater holder detachably supported by the free ends of said arms.

12. In an electric lamp, a non-conducting block having spring terminal arms projecting therefrom, a cut-out coil supported by said block and an armature for said coil adjustably supported by one of said arms.

13. In an electric lamp, a non-conducting block, a ballast device and a cut-out coil detachably supported thereby, a plurality of spring-arms cemented thereto, a cut-out armature adjustably supported by one of said arms and a glower and heater holder detachably supported by the free ends of said arms.

14. In an electric lamp, a non-conducting block, a cut-out magnet having a core one end of which is detachably secured to said block and the other end of which constitutes the stationary contact-terminal of the cut-out, a plurality of spring-arms cemented to said block, a cut-out armature adjustably mounted upon one of said arms and a glower and heater holder detachably supported by the free ends of said arms. I

15. In an electric lamp, a two-parthousing,

a non-conducting block removably clamped between said housing parts, spring-arms projecting from said block and a heater and glower holder detachably supported by the free ends of said spring-arms.

16. In an electric lamp, a two-part housing, a non-conducting block removably clamped between the housing parts, spring-arms and controlling devices depending from said blockwhich the spring-arms project and a heater and glower holder that is-removably supported by the free endsof the spring-arms' 18. In an electric lamp, the combination with a housing having a non-conducting disk in one end and a removable cap at its other end, of a non-conducting block removably clamped between said housing and its cap and having a terminal piece projecting through an opening in the cap, controlling devices suspended from' the block and spring-arms projecting therefrom through holes in the housing-disk, and a glower and heater holder detachablysupported by thefree ends of the spring-arms.

In testimony whereof I have'hereunto subscribed my name this 1st day of September, 1903.

EDWARD BENNETT.

Witnesses:

HUGH A. ORooKs, WILLIAM WILsoN. 

